Year | Value | 2021 | 50,991 | 2020 | 42,827.89 | 2019 | 68,351 | 2018 | 53,061 | 2017 | 70,503 | 2016 | 59,728 | 2015 | 55,864 | 2014 | 65,364 | 2013 | 59,064 | 2012 | 26,996.25441204 | 2011 | 26,535 | 2010 | 19,299.826175869 | 2009 | 16,399 | 2008 | 11,308 | 2007 | 11,139 | 2006 | 7,971 | 2005 | 7,399 | 2004 | 7,403 | 2003 | 7,165 | 2002 | 6,464 | 2001 | 6,486 | 2000 | 6,313 | 1999 | 5,900 | 1998 | 11,900 | 1997 | 12,800 | 1996 | 13,100 | 1995 | 12,600 | 1994 | 13,000 | 1993 | 15,600 | 1992 | 14,600 | 1991 | 13,800 | 1990 | 13,000 | 1989 | 14,600 | 1988 | 13,100 | 1987 | 15,400 | 1986 | 15,000 | 1985 | 13,600 | 1984 | 11,800 | 1983 | 14,300 | 1982 | 13,700 | 1981 | 13,400 | 1980 | 13,500 | 1979 | 14,800 | 1978 | 13,700 | 1977 | 13,000 | 1976 | 13,400 | 1975 | 14,200 | 1974 | 13,000 | 1973 | 13,500 |
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